Define what done means
Lovable describes creating and running products from natural-language requests. Its website lists infrastructure such as hosting, authentication, payments and integrations. That scope makes it possible to start with a product idea rather than an empty repository. It also means a founder needs an acceptance plan covering more than page appearance.
Choose one journey that represents the product promise. For example, a customer signs in, adds a record, sees a result and returns later to change it. Write the expected state after every action. If you cannot describe the expected state, you cannot reliably tell whether the generated implementation is correct.
Check the boundaries between users
Create two sample accounts with different roles and different records. Confirm that each can read and change only the appropriate data. Try the same request with the wrong role and with no active session. OWASP recommends denying access by default and checking permissions on every request; a hidden button is not an authorization rule.
This test matters even when a builder supplies sign-in. Authentication establishes an identity. Authorization decides what that identity can do. A successful login screen does not prove that another customer cannot retrieve a record by changing an identifier. Keep confidential data out of the prototype until these boundaries are tested.
Test the actions that fail
Every happy-path demonstration should have a corresponding failure case. Submit an incomplete form. Interrupt an action and retry it. Attempt an operation on a record that has been removed. If you include payments, use the payment provider's test mode and verify how a failed or canceled payment affects access.
Write useful messages for the person using the product. A generic success banner is harmful if the write did not finish. After a failed action, the interface should preserve appropriate input and explain the next safe step. Avoid exposing internal errors or private record details in those messages.
Keep a path back
Before inviting a wider group, export a small sample of your own test data and check that you can understand it outside the platform. Record which integrations the app needs and what access each integration has. Review current plan limits rather than assuming that a prototype allowance will cover production.
The goal is a controlled first release: one real journey, clear account boundaries and a recovery plan. A smaller product with known behavior is easier to support than a broad demo that has never been tested beyond its first screen.